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1910efa1 MB |
1 | /* |
2 | * arizona-ldo1.c -- LDO1 supply for Arizona devices | |
3 | * | |
4 | * Copyright 2012 Wolfson Microelectronics PLC. | |
5 | * | |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/moduleparam.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/bitops.h> | |
18 | #include <linux/err.h> | |
7b22b9a5 | 19 | #include <linux/of.h> |
1910efa1 MB |
20 | #include <linux/platform_device.h> |
21 | #include <linux/regulator/driver.h> | |
22 | #include <linux/regulator/machine.h> | |
2cce4be9 | 23 | #include <linux/regulator/of_regulator.h> |
1910efa1 MB |
24 | #include <linux/gpio.h> |
25 | #include <linux/slab.h> | |
26 | ||
27 | #include <linux/mfd/arizona/core.h> | |
28 | #include <linux/mfd/arizona/pdata.h> | |
29 | #include <linux/mfd/arizona/registers.h> | |
30 | ||
31 | struct arizona_ldo1 { | |
32 | struct regulator_dev *regulator; | |
33 | struct arizona *arizona; | |
34 | ||
35 | struct regulator_consumer_supply supply; | |
36 | struct regulator_init_data init_data; | |
37 | }; | |
38 | ||
73ee2946 MB |
39 | static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev, |
40 | unsigned int selector) | |
41 | { | |
42 | if (selector >= rdev->desc->n_voltages) | |
43 | return -EINVAL; | |
44 | ||
45 | if (selector == rdev->desc->n_voltages - 1) | |
46 | return 1800000; | |
47 | else | |
48 | return rdev->desc->min_uV + (rdev->desc->uV_step * selector); | |
49 | } | |
50 | ||
51 | static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev, | |
52 | int min_uV, int max_uV) | |
53 | { | |
54 | int sel; | |
55 | ||
56 | sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); | |
57 | if (sel >= rdev->desc->n_voltages) | |
58 | sel = rdev->desc->n_voltages - 1; | |
59 | ||
60 | return sel; | |
61 | } | |
62 | ||
63 | static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev, | |
64 | unsigned sel) | |
65 | { | |
66 | struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev); | |
67 | struct regmap *regmap = ldo->arizona->regmap; | |
68 | unsigned int val; | |
69 | int ret; | |
70 | ||
71 | if (sel == rdev->desc->n_voltages - 1) | |
72 | val = ARIZONA_LDO1_HI_PWR; | |
73 | else | |
74 | val = 0; | |
75 | ||
76 | ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2, | |
77 | ARIZONA_LDO1_HI_PWR, val); | |
78 | if (ret != 0) | |
79 | return ret; | |
80 | ||
81 | ret = regmap_update_bits(regmap, ARIZONA_DYNAMIC_FREQUENCY_SCALING_1, | |
82 | ARIZONA_SUBSYS_MAX_FREQ, val); | |
83 | if (ret != 0) | |
84 | return ret; | |
85 | ||
86 | if (val) | |
87 | return 0; | |
88 | ||
89 | val = sel << ARIZONA_LDO1_VSEL_SHIFT; | |
90 | ||
91 | return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1, | |
92 | ARIZONA_LDO1_VSEL_MASK, val); | |
93 | } | |
94 | ||
95 | static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev) | |
96 | { | |
97 | struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev); | |
98 | struct regmap *regmap = ldo->arizona->regmap; | |
99 | unsigned int val; | |
100 | int ret; | |
101 | ||
102 | ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val); | |
103 | if (ret != 0) | |
104 | return ret; | |
105 | ||
106 | if (val & ARIZONA_LDO1_HI_PWR) | |
107 | return rdev->desc->n_voltages - 1; | |
108 | ||
109 | ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val); | |
110 | if (ret != 0) | |
111 | return ret; | |
112 | ||
113 | return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT; | |
114 | } | |
115 | ||
116 | static struct regulator_ops arizona_ldo1_hc_ops = { | |
117 | .list_voltage = arizona_ldo1_hc_list_voltage, | |
118 | .map_voltage = arizona_ldo1_hc_map_voltage, | |
119 | .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel, | |
120 | .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel, | |
121 | .get_bypass = regulator_get_bypass_regmap, | |
122 | .set_bypass = regulator_set_bypass_regmap, | |
123 | }; | |
124 | ||
125 | static const struct regulator_desc arizona_ldo1_hc = { | |
126 | .name = "LDO1", | |
127 | .supply_name = "LDOVDD", | |
128 | .type = REGULATOR_VOLTAGE, | |
129 | .ops = &arizona_ldo1_hc_ops, | |
130 | ||
131 | .bypass_reg = ARIZONA_LDO1_CONTROL_1, | |
132 | .bypass_mask = ARIZONA_LDO1_BYPASS, | |
133 | .min_uV = 900000, | |
134 | .uV_step = 50000, | |
135 | .n_voltages = 8, | |
ce1bcb7e | 136 | .enable_time = 1500, |
73ee2946 MB |
137 | |
138 | .owner = THIS_MODULE, | |
139 | }; | |
140 | ||
1910efa1 MB |
141 | static struct regulator_ops arizona_ldo1_ops = { |
142 | .list_voltage = regulator_list_voltage_linear, | |
143 | .map_voltage = regulator_map_voltage_linear, | |
144 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
145 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
146 | }; | |
147 | ||
148 | static const struct regulator_desc arizona_ldo1 = { | |
149 | .name = "LDO1", | |
150 | .supply_name = "LDOVDD", | |
151 | .type = REGULATOR_VOLTAGE, | |
152 | .ops = &arizona_ldo1_ops, | |
153 | ||
154 | .vsel_reg = ARIZONA_LDO1_CONTROL_1, | |
155 | .vsel_mask = ARIZONA_LDO1_VSEL_MASK, | |
156 | .min_uV = 900000, | |
a35ff286 CK |
157 | .uV_step = 25000, |
158 | .n_voltages = 13, | |
86a14501 | 159 | .enable_time = 500, |
1910efa1 MB |
160 | |
161 | .owner = THIS_MODULE, | |
162 | }; | |
163 | ||
55a18aef MB |
164 | static const struct regulator_init_data arizona_ldo1_dvfs = { |
165 | .constraints = { | |
166 | .min_uV = 1200000, | |
167 | .max_uV = 1800000, | |
168 | .valid_ops_mask = REGULATOR_CHANGE_STATUS | | |
169 | REGULATOR_CHANGE_VOLTAGE, | |
170 | }, | |
171 | .num_consumer_supplies = 1, | |
172 | }; | |
173 | ||
1910efa1 | 174 | static const struct regulator_init_data arizona_ldo1_default = { |
a9905b1d MB |
175 | .constraints = { |
176 | .valid_ops_mask = REGULATOR_CHANGE_STATUS, | |
177 | }, | |
1910efa1 MB |
178 | .num_consumer_supplies = 1, |
179 | }; | |
180 | ||
2cce4be9 CK |
181 | static int arizona_ldo1_of_get_pdata(struct arizona *arizona, |
182 | struct regulator_config *config) | |
4a8c475f CK |
183 | { |
184 | struct arizona_pdata *pdata = &arizona->pdata; | |
2cce4be9 CK |
185 | struct arizona_ldo1 *ldo1 = config->driver_data; |
186 | struct device_node *init_node, *dcvdd_node; | |
187 | struct regulator_init_data *init_data; | |
4a8c475f CK |
188 | |
189 | pdata->ldoena = arizona_of_get_named_gpio(arizona, "wlf,ldoena", true); | |
190 | ||
2cce4be9 CK |
191 | init_node = of_get_child_by_name(arizona->dev->of_node, "ldo1"); |
192 | dcvdd_node = of_parse_phandle(arizona->dev->of_node, "DCVDD-supply", 0); | |
193 | ||
194 | if (init_node) { | |
195 | config->of_node = init_node; | |
196 | ||
197 | init_data = of_get_regulator_init_data(arizona->dev, init_node); | |
198 | ||
199 | if (init_data) { | |
200 | init_data->consumer_supplies = &ldo1->supply; | |
201 | init_data->num_consumer_supplies = 1; | |
202 | ||
203 | if (dcvdd_node && dcvdd_node != init_node) | |
204 | arizona->external_dcvdd = true; | |
205 | ||
206 | pdata->ldo1 = init_data; | |
207 | } | |
208 | } else if (dcvdd_node) { | |
209 | arizona->external_dcvdd = true; | |
210 | } | |
211 | ||
212 | of_node_put(dcvdd_node); | |
213 | ||
4a8c475f CK |
214 | return 0; |
215 | } | |
216 | ||
a5023574 | 217 | static int arizona_ldo1_probe(struct platform_device *pdev) |
1910efa1 MB |
218 | { |
219 | struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); | |
73ee2946 | 220 | const struct regulator_desc *desc; |
1910efa1 MB |
221 | struct regulator_config config = { }; |
222 | struct arizona_ldo1 *ldo1; | |
223 | int ret; | |
224 | ||
4a8c475f CK |
225 | arizona->external_dcvdd = false; |
226 | ||
1910efa1 | 227 | ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL); |
f4a6c5b4 | 228 | if (!ldo1) |
1910efa1 | 229 | return -ENOMEM; |
1910efa1 MB |
230 | |
231 | ldo1->arizona = arizona; | |
232 | ||
233 | /* | |
234 | * Since the chip usually supplies itself we provide some | |
235 | * default init_data for it. This will be overridden with | |
236 | * platform data if provided. | |
237 | */ | |
55a18aef MB |
238 | switch (arizona->type) { |
239 | case WM5102: | |
a35ff286 | 240 | case WM8997: |
73ee2946 | 241 | desc = &arizona_ldo1_hc; |
55a18aef MB |
242 | ldo1->init_data = arizona_ldo1_dvfs; |
243 | break; | |
244 | default: | |
73ee2946 | 245 | desc = &arizona_ldo1; |
55a18aef MB |
246 | ldo1->init_data = arizona_ldo1_default; |
247 | break; | |
248 | } | |
249 | ||
1910efa1 MB |
250 | ldo1->init_data.consumer_supplies = &ldo1->supply; |
251 | ldo1->supply.supply = "DCVDD"; | |
252 | ldo1->supply.dev_name = dev_name(arizona->dev); | |
253 | ||
254 | config.dev = arizona->dev; | |
255 | config.driver_data = ldo1; | |
256 | config.regmap = arizona->regmap; | |
4a8c475f CK |
257 | |
258 | if (IS_ENABLED(CONFIG_OF)) { | |
259 | if (!dev_get_platdata(arizona->dev)) { | |
2cce4be9 | 260 | ret = arizona_ldo1_of_get_pdata(arizona, &config); |
4a8c475f CK |
261 | if (ret < 0) |
262 | return ret; | |
263 | } | |
264 | } | |
265 | ||
a9905b1d | 266 | config.ena_gpio = arizona->pdata.ldoena; |
1910efa1 MB |
267 | |
268 | if (arizona->pdata.ldo1) | |
269 | config.init_data = arizona->pdata.ldo1; | |
270 | else | |
271 | config.init_data = &ldo1->init_data; | |
272 | ||
4a8c475f CK |
273 | /* |
274 | * LDO1 can only be used to supply DCVDD so if it has no | |
275 | * consumers then DCVDD is supplied externally. | |
276 | */ | |
277 | if (config.init_data->num_consumer_supplies == 0) | |
278 | arizona->external_dcvdd = true; | |
279 | ||
14ffa888 | 280 | ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config); |
1910efa1 MB |
281 | if (IS_ERR(ldo1->regulator)) { |
282 | ret = PTR_ERR(ldo1->regulator); | |
283 | dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n", | |
284 | ret); | |
285 | return ret; | |
286 | } | |
287 | ||
2cce4be9 CK |
288 | of_node_put(config.of_node); |
289 | ||
1910efa1 MB |
290 | platform_set_drvdata(pdev, ldo1); |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
1910efa1 MB |
295 | static struct platform_driver arizona_ldo1_driver = { |
296 | .probe = arizona_ldo1_probe, | |
1910efa1 MB |
297 | .driver = { |
298 | .name = "arizona-ldo1", | |
299 | .owner = THIS_MODULE, | |
300 | }, | |
301 | }; | |
302 | ||
303 | module_platform_driver(arizona_ldo1_driver); | |
304 | ||
305 | /* Module information */ | |
306 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
307 | MODULE_DESCRIPTION("Arizona LDO1 driver"); | |
308 | MODULE_LICENSE("GPL"); | |
309 | MODULE_ALIAS("platform:arizona-ldo1"); |